Pushing b/w sheet film

Like many, I would love a faster b/w sheet film for windy/human/animal subjects.

I currently use TMY with an (N) EI 320 using BTZS tubes and Xtol dev. If I push this by a stop, I am at the absolute limit in terms of useable contrast. EI 500 is what I use for approximately N+2. (I have a densitometer.)
I'm not complaining about the contrast control of TMY, just that it doesn't seem a very good film for push processing.

I don't have much experience with HP5+ or the Fortepan 400, and I wonder whether they may push with a more gentle increase in contrast. I'm open to other developers though I am happy with Xtol with my most used film (TMX, EI 100 for N) and it is nice to minimize the number of alternate chemicals aging in the darkroom. Also, the tube development doesn't work as well with dilute developers because of the small volume of developer the caps hold (60ml).

Any suggestions? I would love something not too contrasty at 800. I promise not to complain about grain. :-)

Errrm! Dare I suggest going to medium format for this type of
work?This'll gain you two stops in terms of depth-of-field or
useable aperture. The grain/format tradeoff stays about equal, giving
you more-or-less the same sharpness and granularity as pushing sheet
film, but with two stops more shutter speed to play with. Plus, you
still hold on to some genuine shadow detail.Plus,
plus, you've a wider range of materials to choose from.Sorry to
burst some bubbles here guys, but LF isn't a panacea for every
photographic problem.

Thanks for all the replies (the server seems down a lot these days).
At a minimum, I'll run some tests on HP5+. N+2 at 800 sounds
appealing.

Pete: I agree that medium format would work better for many
exposures I make, but in my case, I'm usually making about 6
exposures in a day outing and about 2 of them need more speed (for
my f32 and red filter or whatever). I'm already carrying a 35mm
camera as a light meter and for incidental shots. Adding a medium
format to this assemblage seems crazy, although I suppose I could
get rid of the 35mm camera as partial compensation. I'd have to buy
a medium format camera and a couple lenses too -- or a roll back and
a separate light meter would work, I suppose.